Edible Adhesive Glue

So I successfully made my first batch of isomalt jewels and gumpaste molds to hold said jewels. What would be the best adhesive to use to attach the gems to the gumpaste? Edible sugar glue with tylose powder, or royal icing? Same for attaching gumpaste to pastillage, and marzipan to fondant? Thanks for all ya'lls help.

Awesome, thanks ya'll. This is such a big cake, I was hoping for one medium to attach rather than making 3. Im going to get the piping gel, and if that doesnt work, i got stuff on hand to make up a a batch of ri.